package com.zff.wechat.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ConnectException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpResponse;

import com.alibaba.fastjson.JSONException;
import com.zff.wechat.menu.Menu;
import com.zff.wechat.po.AccessToken;

import net.sf.json.JSONObject;

public class GDUtil {
	
	private static final Log LOG = LogFactory.getLog(GDUtil.class);
	
	// 获取access_token的接口地址（GET） 限200（次/天）
    public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
    
    // 菜单创建（POST） 限100（次/天）
    public static String menu_create_url = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=ACCESS_TOKEN";

	/**
	 * @Title: randomNum   
	 * @Description: 获取随机数
	 * @param: @param size
	 * @param: @return      
	 * @return: int      
	 * @throws
	 */
	public static int randomNum(int size){
		return (int) Math.random()*size;
	}
	
	/**
	 * @Title: createMenu   
	 * @Description: 创建菜单
	 * @param: @param menu
	 * @param: @param accessToken
	 * @param: @return      
	 * @return: int      
	 * @throws
	 */
	public static int createMenu(Menu menu, String accessToken) {
        int result = 0;
        // 拼装创建菜单的url
        String url = menu_create_url.replace("ACCESS_TOKEN", accessToken);
        // 将菜单对象转换成json字符串
        String jsonMenu = JSONObject.fromObject(menu).toString();
        // 调用接口创建菜单
        JSONObject jsonObject = httpRequest(url, "POST", jsonMenu);
        if (null != jsonObject) {
            if (0 != jsonObject.getInt("errcode")) {
                result = jsonObject.getInt("errcode");
                LOG.error("创建菜单失败 errcode:"+jsonObject.getInt("errcode")+" errmsg:"+jsonObject.getString("errmsg"));
            }
        }
        return result;
    }
	
	
	/**
	 * 
	 * @Title: getAccessToken   
	 * @Description: TODO(这里用一句话描述这个方法的作用)   
	 * @param: @param appid
	 * @param: @param appsecret
	 * @param: @return      
	 * @return: AccessToken      
	 * @throws
	 */
	public static AccessToken getAccessToken(String appid, String appsecret) {
        AccessToken accessToken = null;

        String requestUrl = access_token_url.replace("APPID", appid).replace("APPSECRET", appsecret);
        JSONObject jsonObject = httpRequest(requestUrl, "GET", null);
        // 如果请求成功
        if (null != jsonObject) {
            try {
                accessToken = new AccessToken();
                accessToken.setToken(jsonObject.getString("access_token"));
                accessToken.setExpiresIn(jsonObject.getInt("expires_in"));
            } catch (JSONException e) {
                accessToken = null;
                // 获取token失败
                LOG.error("获取token失败 errcode:"+jsonObject.getInt("errcode")+" errmsg:"+jsonObject.getString("errmsg"));
            }
        }
        return accessToken;
    }
	
	/**
	 * @Title: httpRequest   
	 * @Description: 发起https请求并获取结果
	 * @param: @param requestUrl
	 * @param: @param requestMethod
	 * @param: @param outputStr
	 * @param: @return      
	 * @return: JSONObject      
	 * @throws
	 */
	public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {
        JSONObject jsonObject = null;
        StringBuffer buffer = new StringBuffer();
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = { new MyX509TrustManager() };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();

            URL url = new URL(requestUrl);
            HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
            httpUrlConn.setSSLSocketFactory(ssf);

            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            
            // 设置请求方式（GET/POST）
            httpUrlConn.setRequestMethod(requestMethod);

            if ("GET".equalsIgnoreCase(requestMethod))
                httpUrlConn.connect();

            // 当有数据需要提交时
            if (null != outputStr) {
                OutputStream outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();
            jsonObject = JSONObject.fromObject(buffer.toString());
        } catch (ConnectException ce) {
        	LOG.error("Weixin server connection timed out.");
        } catch (Exception e) {
        	LOG.error("https request error:{}", e);
        }
        return jsonObject;
    }
	
	/**
	 * @Title: responseOutWithJson   
	 * @Description: 以JSON格式输出   
	 * @param: @param response
	 * @param: @param responseObject
	 * @param: @return      
	 * @return: JSONObject      
	 * @throws
	 */
	public static String responseOutWithJson(HttpResponse response){
		InputStream inputStream = null;
		String result = null;
		try {
			inputStream = response.getEntity().getContent();
			result = HttpUtils.getJsonStringFromGZIP(inputStream);
		} catch (UnsupportedOperationException | IOException e) {
			e.printStackTrace();
		}
		return result;
	}
}
